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<pre>
<a id='L1' name='L1'></a>dnl @synopsis mc_UNIT_TESTS
<a id='L2' name='L2'></a>dnl
<a id='L3' name='L3'></a>dnl Check if unit tests enabled
<a id='L4' name='L4'></a>dnl
<a id='L5' name='L5'></a>dnl @author Slava Zanko &lt;slavazanko@gmail.com&gt;
<a id='L6' name='L6'></a>dnl @version 2011-02-10
<a id='L7' name='L7'></a>dnl @license GPL
<a id='L8' name='L8'></a>dnl @copyright Free Software Foundation, Inc.
<a id='L9' name='L9'></a> 
<a id='L10' name='L10'></a>AC_DEFUN([mc_UNIT_TESTS],[
<a id='L11' name='L11'></a> 
<a id='L12' name='L12'></a>    AC_ARG_ENABLE(
<a id='L13' name='L13'></a>        [tests],
<a id='L14' name='L14'></a>        AS_HELP_STRING([--enable-tests], [Enable unit tests (see http://libcheck.github.io/check/) @&lt;:@auto@:&gt;@])
<a id='L15' name='L15'></a>    )
<a id='L16' name='L16'></a> 
<a id='L17' name='L17'></a>    dnl 'tests_msg' holds the human-readable message to show in configure's summary text.
<a id='L18' name='L18'></a> 
<a id='L19' name='L19'></a>    if test x"$enable_tests" = "xno"; then
<a id='L20' name='L20'></a>        dnl The user explicitly specified '--disable-tests'.
<a id='L21' name='L21'></a>        tests_msg="no"
<a id='L22' name='L22'></a>    else
<a id='L23' name='L23'></a>        PKG_CHECK_MODULES(
<a id='L24' name='L24'></a>            CHECK,
<a id='L25' name='L25'></a>            [check &gt;= 0.9.8],
<a id='L26' name='L26'></a>            [
<a id='L27' name='L27'></a>                have_check=yes
<a id='L28' name='L28'></a>                tests_msg="yes"
<a id='L29' name='L29'></a>            ],
<a id='L30' name='L30'></a>            [
<a id='L31' name='L31'></a>                AC_MSG_WARN(['Check' testing framework not found. Check your environment])
<a id='L32' name='L32'></a>                tests_msg="no ('Check' testing framework not found)"
<a id='L33' name='L33'></a> 
<a id='L34' name='L34'></a>                dnl The following behavior, of "exit if feature requested but not found", is just a
<a id='L35' name='L35'></a>                dnl preference and can be safely removed.
<a id='L36' name='L36'></a>                if test x"$enable_tests" = "xyes"; then
<a id='L37' name='L37'></a>                    AC_MSG_ERROR([You explicitly specified '--enable-tests', but this requirement cannot be met.])
<a id='L38' name='L38'></a>                fi
<a id='L39' name='L39'></a>            ])
<a id='L40' name='L40'></a>        AC_SUBST(CHECK_CFLAGS)
<a id='L41' name='L41'></a>        AC_SUBST(CHECK_LIBS)
<a id='L42' name='L42'></a>    fi
<a id='L43' name='L43'></a>    AM_CONDITIONAL(HAVE_TESTS, test x"$have_check" = "xyes")
<a id='L44' name='L44'></a> 
<a id='L45' name='L45'></a>    dnl sighandler_t is GNU extension
<a id='L46' name='L46'></a>    dnl AC_USE_SYSTEM_EXTENSIONS is reguired
<a id='L47' name='L47'></a>    AC_CHECK_TYPES([sighandler_t], [], [], [
<a id='L48' name='L48'></a>        #include &lt;signal.h&gt;
<a id='L49' name='L49'></a>    ])
<a id='L50' name='L50'></a> 
<a id='L51' name='L51'></a>    # on cygwin, the linker does not accept the "-z" option
<a id='L52' name='L52'></a>    case $host_os in
<a id='L53' name='L53'></a>        cygwin*)
<a id='L54' name='L54'></a>            TESTS_LDFLAGS="-Wl,--allow-multiple-definition"
<a id='L55' name='L55'></a>            ;;
<a id='L56' name='L56'></a>        *)
<a id='L57' name='L57'></a>            TESTS_LDFLAGS="-Wl,-z,muldefs"
<a id='L58' name='L58'></a>            ;;
<a id='L59' name='L59'></a>    esac
<a id='L60' name='L60'></a> 
<a id='L61' name='L61'></a>    AC_SUBST(TESTS_LDFLAGS)
<a id='L62' name='L62'></a>])
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